US4368310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of polymerizing sheets
Assignee: PPG Industries Inc
•
Filing: 1981-10-23
•
Granted: 1983-01-11
•
Expires: 2001-10-23
Abstract
Abstract Disclosed is a method of polymerizing a monomer by forming a film or pool of monomer atop an immiscible liquid and initiating the polymerization. In this way there is obtained a thin sheet of polymers substantially free of imperfections on the surface thereof in contact with the liquid. According to a further exemplification a second, less dense, but also immiscible liquid is established above the monomer whereby to form a second smooth surface.
Inventors
- 👤 Ivan R. Leatherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:00
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
A method of polymerizing aliphatic diol bis(allyl carbonate) monomer to form polymers thereof comprising: providing a pool of liquid in which the monomers and the polymers to be formed are substantially insoluble; forming a layer of monomer and initiator atop the pool of liquid; and thereafter recovering polymer from atop the pool of liquid.
Claim 2
Independent Claim
54 words
A method of polymerizing aliphatic diol bis(allyl carbonate) monomer to form polymers thereof comprising: providing a pool of liquid in which the monomers and the polymers to be formed are substantially insoluble; forming a layer of monomer and initiator atop the pool of liquid; and thereafter recovering polymer from atop the pool of liquid.
Claim 3
Dependent Claim
27 words
The method of claim 1 comprising continuously forming a layer of monomer and liquid on the liquid pool, and continuously recovering polymer from atop the liquid pool.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the liquid pool comprises mercury.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the liquid pool comprises an aqueous solution of higher density than the monomer and the polymer.
References Cited (Backward Citations)
US2326326A
Cited
US3514341A
Cited
US3700761A
Cited
US3816571A
Cited
US3935292A
Cited
US4095772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |